Valve Software’s transcendent physics and teleportation puzzler Portal already runs sublimely through Steam for Mac… as long as you have a modern MacBook Pro or iMac. But what if Portal wasn’t a modern game, but a classic Macintosh text adventure? This brilliant mock ad re-imagines Portal as a lost game rediscovered through a lost Saturday morning advertisement, complete with an appearance by a badly puppeted GlaDOS. Brilliant… although that green text really looks more at place on an Apple II, don’t you think?